brkt: drawing one

November 20, 2008

I think that topography + prevailing winds + airborne moisture over oceans might make a very nice key to locating fog-friendly locations, or plausible sites for the intervention.  Precipitation levels (I think below 10, possibly between 10 and 15 in/year) would locate where the intervention is required.  Growing cities would locate where the intervention could have a substantial impact on patterns of urbanization.

 

drawing 1a

Article, “Tapping into Fog”:

sets out conditions for fog farming:

Prerequisites
This technology is best suited to areas where fog is consistently available and can be intercepted on land. [note: this suggests to me that intercepting at sea is also possible?] Fog should occur during the season when water is most needed. Five other conditions are also important: 1) a mountain range with an average altitude of 500 metres or higher; 2) the principal axis of the range should be perpendicular to the prevailing wind (this increases the amount of water collected); 3) the site for water collection should be as close as possible to the user community; 4) a broad basin on the other side of the mountains where high daytime temperatures help to draw the ocean air through the mountains is desirable; 5) prevailing winds of constant direction throughout the year.

Potential users
Communities around the world (generally in coastal areas or on islands, but sometimes inland) with little rainfall and similar atmospheric conditions to the prerequisites above. In addition to Chile, Peru, and Ecuador, areas with the most potential to benefit include the Atlantic coast of southern Africa (Angola, Namibia), South Africa, Cape Verde, China, Eastern Yeman, Oman, Mexico, Kenya, and Sri Lanka.

[also: does this argue against looking at Dubai and Nouakchott?  Perhaps.  Though there’d be nothing wrong with an offshore fog farming system, perhaps this suggests we’re looking in the wrong places.]

Due to considerations raised by this article, I would propose adding two more items to the first drawing:

4. topography, particularly focused on locating mountain ranges and basins.

5. prevailing winds

 

 

drawing 1 early thoughts

Layers:

1. Fast growing cities of the world

UN World Urbanization Report, produce charts by country of project city populations:http://esa.un.org/unup/index.asp?panel=2

2. Precipitation

http://media-2.web.britannica.com/eb-media/75/7575-004-27272BBA.gif

http://ga.water.usgs.gov/edu/graphics/wcprecipitationworldmap.gif

rain shadow

3. Airborne Moisture/Fog

Report on Atmospheric Moisture, showing concentration of moisture over oceans.

USGS on where water is (showing that airborne moisture is a very tiny portion of global water; the point of this is that pulling it out of the air is not a problem in terms of causing climate trouble elsewhere)

Global Humidity Index, not sure how useful this is

6. I could see mapping droughts as well.  I could also see that as a sub-map or seperate drawing.  No reason we can’t generate all these layers in one drawing and then utilize various combinations.

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One Response to “brkt: drawing one”

  1. eatingbark said

    Updated

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